The Inline Clip Barrel needs only Three (3) wraps of Electrical Tape to fit snugly into a MegaXL Dart.
the print quality is amazing it also has an good air seal
I bought set of barrel attachments and the connector to add those barrels to a Rival Knockout. They all perform well except the Hyper 3 round barrel, which only shoots two rounds and not very well. I suspect the small balls do not work well due to low air pressure, a single round barrel would be better, but I may be able to improve the performance with some tweaking.
I plan to get a Mega XL attachment when it is available, as I think that would be a lot neater than the Mega XL Big Rig alternative.
Fit perfectly and works with the barrels I had for my Little Rocket (of course)! Very happy and would certainly buy again